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Deferred Tax Liability, Net (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Summary of deferred tax liability |  |
Deferred tax asset - current (accrual of employee social insurance) | $ 187,255 | $ 189,617
Deferred tax liability - current (net investment in sales-type leases) | (1,597,776) | (1,520,538)
Deferred tax liability, net of current deferred tax asset | (1,410,521) | (1,330,921)
Deferred tax asset - noncurrent (depreciation of fixed assets) | 9,590,713 | 10,250,395
Deferred tax asset - noncurrent (asset impairment loss) | 879,480 | 450,706
Deferred tax asset - noncurrent (interest income receivable in sales-type leases) | (10,560,354) | (11,527,594)
Deferred tax liability, net of noncurrent deferred tax asset | (90,159) | (826,493)
Total Deferred tax liability, noncurrent per ASU 2015-17 | $ (1,500,680) | $ (2,157,414)

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